Lyndon is a town in Caledonia County, Vermont, United States. As of the 2020 census, the population was 5,491. Lyndon is the home of one of the campuses of Vermont State University. The town contains five unincorporated villages, Lyndonville just east of the geographic center of town, Lyndon Corner in the south, Lyndon Center in the center of town on the west side of Lyndonville, Little Egypt in the north, and East Lyndon in the southeast.